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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1892e2fd496d7a41bf745d03ad1031cc54fa3955d30f9e91f26a7961cf291f1b' 
  AND token = 'Zh30VXUcYE0yuw/QVrdM6mQaJIRK1El5+3R1EKOCg38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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