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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c5a13ea55f1506d52336fd6aa95e511c58fc96d0ef8d39c08e27124261e10c9' 
  AND token = 'ND67OnfHMkmK/im8bqNY5xYJc5TVtcDT6NAV1G2ccUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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