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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3caa76fda4fb88ebf51add28a010c6e89ed995a98e74b4eb9c7862d1ee570de' 
  AND token = 'Tu0ednPZvOat1gtQ6nWl55W6PL8ttv8Ab4GWWDkQor8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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