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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e57346a194a397f4ad4ea24814f6b2479708e98cd092fd047a196fee8c67bbec' 
  AND token = 'e/qkrwbrySWj1KDaOuJJF/YOj9zft8MgW/MDBO2Wrmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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