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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94cdf7a2a7533d719a05d51b9a5da81caf9ffa211bd230cb464b55f8c0552187' 
  AND token = 'ZmigyPw/7JykD8dIjgn4r1yYjeMpR8mecbAvy/+5iuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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