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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5436be348742a229c4f2da7df3f8f6612a1c61902b67698b82af27d311d21f0' 
  AND token = 'X5Yy93lWKpIG8mkTtSI0WuHkCq96uy4xDtClOm0C/Ps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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