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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06713a5fa8c1001623af7250e224176fc521cffd7fc80bced9ef3c15ca5dbacb' 
  AND token = 'RfNc0GfoFVr1KahGErwXxInPPu7cYPqAaqzJe6FV8TA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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