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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67073c9caed7be255ad8b0e69ba09151fd9ffb5674688ef405e2e00b3f4d6dc2' 
  AND token = '/vC0c14ZwUcfbbeMgyGL0dN10tZJFMERNg9xS2hoZbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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