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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '907b549ca1b58a98a446d79f5939cb7cb5cd7bae716f11d13aaaba5119fa1ba9' 
  AND token = 'CDJ0d5ffxd/Gmmy2eS0fN1fmcdAk+X9mZvHy/i9iDB8=' 
  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"
    }
  }
}