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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcaa53778333b506c24c4356946073fc958f4b9b6e58af9f588b58c52fa0f874' 
  AND token = 'ZxG9XA84IXS+m6kgbQ58POVvAt1w5TKHtYQIUisjIzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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