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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6fb980ce4a464105e1309ba469cb877d428aec16dd472663d1f16a2af8b76ca' 
  AND token = '8JekujDHQf5XtDaX0uKP1tq4k/CCvFF1pDtmMKfVHV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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