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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0d99663582f604a896377e871b9d33f07571c0c0edd6bc7bd439c4d5e5439db' 
  AND token = '/P8e17rcaX0rkTAjycEeUjlmHGJ4BwVRHrckRBUWrIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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