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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6eaf0626e65a2f61763152667c1e5889715ef5f771564fc535778f314966188' 
  AND token = 'G/EZt4AN11L7ozJqgUtS0NU0HcHhw76G+Chp4CJ7OyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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