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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fadcedb3de116f8c698c671b73eed2672ee1e180d55e4af4c2c344c5f41ec44f' 
  AND token = '3ZOqwO7U4t8arn/sxNp1JOiKB7C2GbSKXYnD0EEJUog=' 
  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"
    }
  }
}