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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6630edd718416d58a20db52c8b23001727ed884de92f843d1bf0850c0b8d9e5a' 
  AND token = 'j4wRwat/nYjksZlw4A2u7CQd6MYsLJjpohjPrXxRAy0=' 
  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"
    }
  }
}