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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '422307c388590b2e047b5abbaffd65c8cd8730f9db718e25a0becb7f5adb496e' 
  AND token = 'k3ESCi1pKXpy0CL8UTdW7ijD6Wv6cm1GNzpnxv+yWe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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