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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b73e0502cb9d2333b8e838f36dca585487649c5de2e11064b2939c15ef6f1e13' 
  AND token = '1aO3s2dN/jtoPERL0k5aIyh/8Aun3LdgrYp7pUDVw9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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