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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd612e17125b52441bdcbca5fd698218a83ac76497ea3b9aa87cb3b2c44fac25f' 
  AND token = '4i2DPl5+K/uYW4/zOPXdep09ytcZHs23Q57ZrwLzBzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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