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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dccb0e6503519409af8ae78613ea44cd4475e1b612f78e6d5f8646601103b32' 
  AND token = 'wT9lzY1Gff49X6bz+aavLPPP64sXBNo8UqAZs2qeNLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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