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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14162c895c8bb2e2c3eb233554c0196ca64a1a666bb65c0fb60bb689d156a6b9' 
  AND token = 'k4uwF5+Ct14zxu50E9fI6ylOshDs57acmnoIgm1cBYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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