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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f2e6310125120c06ef54d0ddadcf6dd55ff27ca3b95e5a5a7e95fc4aa610268' 
  AND token = 'pQGpIWst2RldiNT/85sM5J0iv+GBOczPknb4okS1Oyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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