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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd11b806dbb769ee103f613e70f0d583498983bfee31f84c868d0450f93a7b314' 
  AND token = 'z6ortzjXXW81621vCjzWEMWbndI2o9SrWXz9/1d1DjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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