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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2be2508b44da895a18afb5e96662db9d3fcc4199951dca7b4892a7fbd4cffb4' 
  AND token = 'vjPm5pMfuXhtpnpiv+UY0p76EBbKL51ngha/naMlymM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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