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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77b40a0f489d3d15d0729b3b314ef3a392cfbcd3e4f75d2b17127d18f1dbeb59' 
  AND token = '6+Z7mscnBxOITnaxTekCDy40W5iZoB4zJP/GJ1m9Lf4=' 
  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"
    }
  }
}