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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61a448c56e2d19eeab26728ffbcc25b52f6d02e898cb9349672233d0d2edc5af' 
  AND token = 'gM3s46/N9EtvwQw3yXJ99oT8Pl0O633eYFuDQ6olw9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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