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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ab7ec2670446dd51e23fa17b0f135124b2c9b2dc05133b0fed9be28d5e3b76c' 
  AND token = 'rx/g1B60aqL5XJRJi/pxwNEWIfE3/k7mYKTCdm3S8z0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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