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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34bb990351b96668f55442153caa12dbb2f04f3fdbdc94e6e0088e992310b636' 
  AND token = 'BzeG6pUhyE0qvH+eUz2RHhhrURvaED3I+oVmvDY4Eh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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