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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6623ee93192f77094cadc63f4e2d38415d79abfd5d66945adf263d8c1433ebfa' 
  AND token = '4cEAcKO/km6+3Q4fj31bhnJC0ufSNX45J/sMsCtuMHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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