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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57528cf4f6dfaae12c1227030ec12657eb3244132e7528bea9ffbbe3db02cb60' 
  AND token = 'E2e6A8sTfIGu6fbBQCIQQDS563yGvzShbfJg3R/9d8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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