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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90e47c36e7745206da4349b52726179e9a01387dfe9b150cc1ff2a6fca02f1aa' 
  AND token = 'UZmEf0pkBMgVf6dcgD9ZYIDX33K0U4tHGHqHiQWg74Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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