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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc3e3e184e74e0369c0b24c21a04b6b053047b48608dbc423501ed00e5177dd0' 
  AND token = 'vSGt47AGYfj0yR5LWGcrSR4SJadEBdjqq7Z94sd8SPk=' 
  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"
    }
  }
}