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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03e888c9cac51c348dd0337e22ea7af58a6a2cfe04c514571a49392e193ad56e' 
  AND token = 'tz/RJ+HI6OwlAQ7N9dWP25AoVKwJ1qYOoVuVEJOOJkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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