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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a88e6014108bf34b4c6e1a92824615bd6edcad462e7bbadb42666af6a2dd45d' 
  AND token = 'Pzt6Af3+TI2TMACAH5t7BrPnq30qPJuVdTMw8YHSt78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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