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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f15ae083785ce17ce20232b5b7c714279ac96685333ef78e3bb994857e7d4c8' 
  AND token = 'pDmDDcSJOnKOF4hiu5o1Kq5Y5pc9EazsTXy3QdlZAhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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