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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '657e4b707e67bd3e388b8c007f46296a9257a3e0c077c0b90d29c5a27bc47a92' 
  AND token = '5z5FSl5/j2YLMErJ0ZwP9BH4zmg7Z31Q79063XTFp7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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