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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e947c420b5ec35e84d71da6d4f2833d9970dc170555ab7152a8ae00e1f3b095c' 
  AND token = 'kCwbVBBStoaZJRg4TYhJn4SMAWZ5qCZMKT4NDYQSVZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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