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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f018a56495cfff25a3deb2ee26dc058a12a80e262eaad07268cb6522b95cfc4b' 
  AND token = 'vrDeovzLcXqRMkqHGg/5m0dZmLxXdVmZSwn3VM/Xz+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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