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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e02c9a3897ed9e678074d089c4e4f03d289b7df986b605eb448147f797d97b3' 
  AND token = 'cs4T72jVSgPE9A7O1AvQNPCa3Y9cc3DOw1MosGM/EHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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