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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41443df3331174023a2f3a03cbb9d5cb3051b93c55661877c853a8021625a44b' 
  AND token = 'ELD1SEyuPl4PZQyBzQga4Z4uLkUFYxRUOGyq4aCIhGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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