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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e58375067066d8df42724aa7a01dd3274c04895dcb7ff12af3f2c5d9904f6618' 
  AND token = '6Z7dJ7OAHdqIUK+U8tVLey7he6pn5b4p81c7FMLigAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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