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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9151fab492aa52fea5c2150c4daac7385cecd315ca7259d14979c564f8470542' 
  AND token = 'f9v/zCur9H9V0eHBljsr8p8KMC+xJ8lB1JAsb6cjWp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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