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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab1940684897b8fc96669ac6753dc4b1f1824f413e14c2c28d4e8564c8b6cda5' 
  AND token = 'b7A9uOOFgtXrlKgZL+Uk4FBAQi1S74HJylxhjxOncgw=' 
  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"
    }
  }
}