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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ab671c444f7c2431bd3a6184615f6d0ee29047e93f65356e5359cb4a494d6ec' 
  AND token = 't/Dq0oiR/qfq6YVadw/FvE8l6lbJLLMnH8ldYa8xHCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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