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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0962f7a4fd24b2d849ad98ae0c7ae60b2051079965f48caf084aa378afa16eb4' 
  AND token = 'TVoIA5zw5ExASx+3dnGbD+9ZmnWc20fzs9jV9eXEIL0=' 
  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"
    }
  }
}