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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb9f62a506f7f5add386d35b9226fb34ee5f2cdbce6989c90265f8c21469fbb0' 
  AND token = 'r17m3V6Nnbtj6Pa1vBDdIgJQ/PWwcpbZrBxkByIFMko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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