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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b353b7909a237cf90c0e13a9f9dd82b3fb8c33b1fefbe082311e4a5170a30838' 
  AND token = '3i5sIa/MBRRYTUF5jp8kMaaHe/QqLMr4nRJvQAu5Yfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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