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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c77ae6670f51018135231cade4307da954e18b71c504ceefb9bf812e90312992' 
  AND token = '8rgkF05lkaLtGatwpB+ooNrAAIK3acx25mxueE/J8CQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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