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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e3b4c5a39d13e9e27a2328c2b2ca2f3c313a4604f6d3b3c9cb84587dac5893d' 
  AND token = 'iLIL1UPCIXT3TapFkOraw4HyEoJSgDaf0TWWGSBvuzA=' 
  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"
    }
  }
}