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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89d5eb4a3fcae3c41a90b03d080707c1712a7303533182d0436d26730f8a1bb3' 
  AND token = 'JVavZbM5lObwSxPeYX/F05rpWcohxDRk5i9/6b5/Dvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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