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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaf0d64db2242ebfdfdc96b50299b90c89bd8ea5a7441fd8b244f8cde1447769' 
  AND token = 'AweT36RWox0FupLCL1dAlLUy1r0RE+osljSjWVpoMb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}