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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e6a529b0a6fb99327ee303ba25adea92771e30b831bc7cfc9614728f44a0135' 
  AND token = 'q06On8YUpKqYm3zDk19IYwbpt44HMXbZ8izXof2hK70=' 
  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"
    }
  }
}