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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0663e769bd9ab52658e5fcd53b12d9f01a27605ed6ccee3f3e0c7700499fb56' 
  AND token = '8SDBj5QlgfwWfPipSBOavTJQPPoXlaH1k5qXma1G+/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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