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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a888a95df0c8ca1643b5e7e1af3f27a645baa37581e5d29d7986d19529fbbda0' 
  AND token = 'lRxuHzK4q6oqPcMSZp06lessHvMSl8yWSu70qvdtbiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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