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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ecb8fcb4cf4ea579e9ca3576c894eb55d2d762d6da8aebd0122a702b188e94d' 
  AND token = 'w6upRRuPbbrHM//TXMdv69Znak3Ydc9quJ7OsRIQXq0=' 
  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"
    }
  }
}