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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be78cef3dc45453272f145e64f04a1d69f916a6b5a60d286cd10796607725e9d' 
  AND token = 'eicgN8KHtSWJsPo6ofCRz5u6pzwgCMmoqzgZBsVyft0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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