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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '756e49b48735067720a8784fd81b161b088062a971859ba410f0dafb143cba99' 
  AND token = 'QOyzuRrdedKRvdPUC206EH7ANX5upBl5W2a5qCKNBWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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