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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf5a05c8f14520d0a6771da270e6d775858b1ab487bb22c93f942f16c8341c7f' 
  AND token = 'xmZb5rAIVQycPGJdGT4ARZJ/kkYDYVIvbk/pns6GUw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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