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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '577ad4d4112e6a44197b24d154e61de29d3a16c413e10c94cafc26cc9cf25b92' 
  AND token = 'K59AUPJayEXzib8QAaW/YodfQ4Q4qm2+s44iAcYA8zE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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